Optical vortex array: generation and applications [Invited]

Optical vortex arrays, with their unique wavefront structures, find extensive applications in fields such as optical communications, trapping, imaging, metrology, and quantum. The methods used to generate these vortex beam arrays are crucial for their applications. In this review, we begin with introducing the fundamental concepts of optical vortex beams.Subsequently, we present three methods for generating them, including diffractive optical elements, metasurfaces,and integrated optical devices. We then explore the applications of optical vortex beam arrays in five different domains.Finally, we conclude with a summary and outlook for the research on optical vortex beam arrays.